Cabrera Castle
The castle was built at the end of the 15th century and, today, it still stands tall overlooking the entrance to the port, and was constructed the aim of defending the site from the invasions of the Sarracens who repeatedly attacked Mallorca at the time. It’s worth bearing in mind that it would still be 100 years before the Catholic Monarchs won back the keys to the Alhambra in Granada and, with that, ensure the removal of the Moors from Spanish territory.
Wikipedia